US9833745B2 - Filter device and a production method - Google Patents

Filter device and a production method Download PDF

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Publication number
US9833745B2
US9833745B2 US14/238,155 US201214238155A US9833745B2 US 9833745 B2 US9833745 B2 US 9833745B2 US 201214238155 A US201214238155 A US 201214238155A US 9833745 B2 US9833745 B2 US 9833745B2
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United States
Prior art keywords
gasket
housing
outwardly extending
laterally outwardly
clamp
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US14/238,155
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US20140251893A1 (en
Inventor
Christian Goebbert
Manfred Volz
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NANOSTONE WATER GmbH
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NANOSTONE WATER GmbH
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Assigned to KSM WATER GMBH reassignment KSM WATER GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VOLZ, MANFRED, GOEBBERT, CHRISTIAN
Publication of US20140251893A1 publication Critical patent/US20140251893A1/en
Assigned to NANOSTONE WATER GMBH reassignment NANOSTONE WATER GMBH CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: KSM WATER GMBH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
    • B01D69/04—Tubular membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/02—Hollow fibre modules
    • B01D63/021—Manufacturing thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/06—Tubular membrane modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/06—Tubular membrane modules
    • B01D63/061—Manufacturing thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/08—Flat membrane modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/003—Membrane bonding or sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/02—Specific tightening or locking mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/04—Specific sealing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/04—Specific sealing means
    • B01D2313/041—Gaskets or O-rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/04—Specific sealing means
    • B01D2313/042—Adhesives or glues
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/20—Specific housing
    • B01D2313/201—Closed housing, vessels or containers

Definitions

  • the invention relates to a filtration means for the filtration of liquid media according to the preamble of claim 1 .
  • an object of the invention is a process for producing a filtration means for the filtration of liquid media according to the preamble of claim 11 .
  • the invention relates to the field of filtration means formed by membrane modules for the filtration of liquid media, in particular polluted water (so-called unfiltrate).
  • a membrane module comprises, for example, at least one elongated filter element, which is traversed by at least one longitudinal channel. It consists of a porous material, for example ceramic. The interior wall of the longitudinal channel is coated with a very thin filter membrane.
  • the membrane module further comprises a housing, preferably made of stainless steel, that surrounds the filter element. On its way through the longitudinal channel, the unfiltrate is purified transverse to the direction of flow by the filter membrane that is applied to the wall surface of the longitudinal channel and exists as a filtrate from the wall surface into a collecting space between the filter elements and the housing.
  • the housing has to be sealed reliably to the outside at least for liquids.
  • filter elements having round cross-sections that are referred to as “tubular membranes” and in which the liquid medium is filtered usually from the inside to the outside.
  • the filter membrane is applied in the interior of the longitudinal channels.
  • filter elements having rectangular in cross-section are known in the prior known, which are referred to as “flat membranes” and where filtration is performed usually from the outside to the inside.
  • filtration in a respective reverse direction of filtration is also known for both types.
  • the filter element consists of a monolith
  • the monolith is usually machined in the upper and lower portion in such a way that the diameters of the end pieces are slightly smaller than that of the actual body.
  • 0-rings to gasket against the housing of the membrane module are fitted to the machined ends and the monolith, including the 0-ring or alternatively an L-ring is inserted into the module housing.
  • the membrane module comprises a molded membrane bundle (i.e. multiple filter elements arranged in parallel), preferably an L-shaped gasket is pre-installed in the module housing, as is well known, into which the entire bundle is inserted precisely fitting.
  • the L-shaped gasket may be first placed on the membrane bundle and then inserted together with the latter into the housing, preferably, however, the gasket is pre-installed in the housing.
  • WO 2006/009449 A1 shows a membrane module having filter elements, which have at least one end a conically formed ceramic flange, e.g., made of refractory concrete.
  • DE 690 19 552 T2 shows a membrane module, in which the end portions of the filter elements have an extra thickness with an oblique shoulder, wherein the extra thickness may be made from different materials and the shoulder interacts with different gaskets.
  • DE 198 46 041 A1 shows a membrane module, in which the end portions of the filter elements are sealed against a housing, for example, by conically formed L-shaped gaskets.
  • the conical surface of the gasket interacts with a complementarily formed surface of a lid of the membrane module.
  • the object of the present invention is to form a membrane module in such a way that a reliable separation of the filtrate and unfiltrate is ensured even with thermal expansion of different materials and that this can be achieved by a simple installation without damage or slippage of the gasket.
  • the membrane module is produced in a cost-effective manner.
  • the object is achieved by a filtration means with the features of claim 1 and a process having the features of the other independent claim.
  • Advantageous refinements are specified in dependent claims.
  • the present invention is based on the idea to create a new type and mode of action of a sealing for the filtration means.
  • the filter element Upon interaction of the conical surface of the flange which is part of said at least one filter element, with the complementarily formed surface of the gasket, the filter element is securely fixed in the housing for operation, and a slippage of the filter element in the housing and damaging the gasket during installation is avoided. In doing so, a reliable separation of the filtrate from the unfiltrate is realized without any possible accumulation by microorganisms.
  • the invention is independent of the use of round or flat membranes as the filter element, as well as independent of the number of filter elements in the housing.
  • the housing and the filter element or filter elements are preferably designed in a circular cylindrical cross-section; however, they can also be configured polygonally.
  • the gasket has an inwardly extending lip portion which covers the flange at least partially.
  • the area of a sealing area between the flange and the gasket is increased, thereby increasing the reliability of the gasket significantly.
  • the flange is formed by a casting compound applied at the end.
  • a casting compound applied at the end.
  • it is preferably provided for the entire end portion of said at least one filter element or the bundle of filter elements being closed to the outside with the same casting compound during the manufacturing process.
  • the flange can be produced in a common production step for closing the entire end portion and thereby forms an integral unit with said at least one filter element.
  • the casting material to be applied for this purpose to the end portion of said at least one filter element for example, in the form of a melt, which cures to form a solid casting compound, comprises a plastic, preferably a polymer, in particular a thermoplastic material.
  • Thermosets or two-component plastics such as epoxies or acrylates are possible also.
  • the above mentioned plastics work reliably, are easy to process and are inexpensive.
  • all materials of the filtration means mentioned are approved materials for drinking water.
  • the conically formed surface of the flange can be generated by immersing the end portion of said at least one filter element in a conically formed shape in the casting material during the manufacturing process.
  • the conical surface is generated subsequently by mechanical machining.
  • the gasket is also advantageous for the gasket to be impinged by a clamp axially, preferably resiliently.
  • the clamp is preferably formed as a metal plate which, in addition, can be angled.
  • the clamp in the filtration means acts, in particular, amating flange or fixing plate to the gasket, and thus supports the sealing effect. Also, in doing so, the filter element is simply and securely held in the housing.
  • a sealing ring is arranged between the housing and the clamp (which is not mandatory).
  • the housing preferably has a notch, into which the sealing ring is inserted with a portion of its cross-section.
  • the additional sealing effect is produced hereby, for example, an extension of the clamp near the gasket pressurizing the sealing ring inlaid into the notch, and compressing it.
  • the sealing ring is preferably formed as an O-ring; also conceivable are angular formed gaskets or partially angular formed gaskets or flat gaskets, where in using flat gaskets the notch must be adjusted accordingly, or the notch must be omitted entirely.
  • the clamp and/or a side of the gasket facing the clamp is structured by projections and/or recesses.
  • the recesses can be formed as grooves, for example.
  • the recesses and projections at the gasket serve to compensate for any unevenness of the device, for example.
  • the clamp is impinged in the axial direction of the filtration means and thereby the projections are partially compressed, so that the sealing effect is produced.
  • the gasket can be fixed accordingly by to a projection in the clamp and a corresponding recess in the gasket.
  • a process for manufacturing the filtration device according to the invention provides for the following process steps:
  • the flanges of the first and second end portions are formed identically;
  • first resilient gasket at the inner periphery in the interior of said housing at a first end, which is formed complementary to the conical shape of said first flange on its side facing said first flange.
  • first gasket may have recesses and projections at an exterior surface (transversely to the form of the gasket)
  • the second gasket may have recesses and projections at an exterior surface (transversely to the conical form of the gasket);
  • the production costs are very low.
  • the assembly of the filtration means can be done on location (on site). Also for repair or service purposes, a simple disassembly is possible.
  • the term “casting material” includes hereby all plastics, which initially are in a substantially liquid phase, for whatever reason, and which subsequently cure, again for whatever reason. Suitable plastics include polymers, thermoplastics, thermosets, two-component plastics such as epoxies or acrylates, and many others.
  • FIG. 1 shows a filtration means according to the invention in longitudinal section view
  • FIG. 2 shows an enlarged longitudinal section through an upper end portion of the filtration means of FIG. 1 ;
  • FIG. 3 shows a representation similar to FIG. 2 with different clamps
  • FIG. 4 shows a more detailed representation of a portion of the embodiment of FIG. 1 ;
  • FIG. 5 shows a representation similar to FIG. 4 of a second embodiment with another housing
  • FIGS. 7-9 show section views through an area of the filtration means in accordance with one or more embodiments.
  • FIG. 6, 10 sectional views through an area of other embodiments of filtration means with different clamps.
  • FIG. 1 shows a filtration means 10 according to the invention in longitudinal section view.
  • the filtration means 10 comprises a tubular housing 12 which is preferably made of stainless steel.
  • Two outlet ports 14 are arranged laterally outwardly at housing 12 , which are preferably standardized to allow for compatibility to other means.
  • the filter elements 16 are arranged in the longitudinal extension of housing 12 .
  • the filter elements 16 consist of porous material, preferably ceramic, and have longitudinal channels 18 and a filter membrane on the interior surface thereof.
  • the filter elements can be tubular membranes and/or flat membranes.
  • the direction of filtration is preferably from the inside to the outside. This means that the medium to be filtered (unfiltrate) is introduced in one end of each longitudinal channel 18 (see arrow 20 ). On its way through longitudinal channel 18 , the unfiltrate is purified transversely to the direction of flow by the filter membrane that is applied to the wall surface of longitudinal channel 18 (porous material) and exists as a filtrate from the wall surface to the outside (so-called permeation).
  • the interior space of housing 12 has to be sealed reliably to the outside.
  • the filter elements 16 in FIG. 1 have a sealing casting material 22 at the lower and upper end portion enclosing filter elements 16 .
  • the casting compound 22 is produced from a cured casting material, wherein the casting material consists of a plastic, preferably a polymer, in particular a thermoplastic material. Thermosets or two-component plastics such as epoxies or acrylates are possible also.
  • the assembly comprises in an extension of casting compound 22 , each above and below (in FIG. 1 ), a flange 24 in the form of a ring-shaped collar that is extending radially outwardly, which consists preferably of the same material as casting compound 22 .
  • flange 24 is an integral part of the filter elements in the interior of housing 12 .
  • Both flanges 24 are formed conically oblique on a radially projecting circumferential surface 25 and preferably identical at top and bottom, however, mirror-inverted.
  • the lower diameter is axially outside and the larger diameter is axially inside.
  • a resilient gasket 26 that is formed complementarily to flange 24 is arranged between the conical circumferential surface 25 of flange 24 and housing 12 . That is, it has a radially inner conical or oblique circumferential surface 27 , with the smaller diameter axially outside and the larger diameter axially inside. Gasket 26 has a radially inwardly extending lip portion 29 which partially covers flange 24 .
  • gasket 26 is pre-installed at the lower end portion on a shoulder 28 of housing 12 .
  • housing 12 is initially open, so from there, the filter assembly consisting of filter elements and casting compound can be inserted into housing 12 .
  • a dimensional accuracy of housing 12 and said filter assembly is a prerequisite.
  • gasket 26 is inserted in the upper end portion between flange 24 and housing 12 . Then, housing 12 is sealed with a clamp 30 in the area of flange 24 and gasket 26 .
  • Clamp 30 is preferably made of a resilient sheet metal which also can be angled. Clamp 30 acts as a fixing plate or as a mating flange and impinges gasket 26 with an axial force. Thus, the interior of housing 12 is protected against a potential penetration of liquid which is not running through longitudinal channels 18 . More detailed information on the configuration of the areas of gasket 26 for the improvement or optimization of a sealing effect is provided below.
  • FIG. 2 shows a schematic diagram for explaining the function of the conically formed gasket 26 according to the present invention. All embodiments have in common that in each case the conically formed circumferential surface 25 of flange 24 rests flush on the complementarily formed circumferential surface 27 of gasket 26 .
  • gasket 26 and flange 24 have a same axial extension of the conically formed surfaces 25 and 27 .
  • a gasket area is not formed punctiform as when using an O-ring, rather the sealing area is realized as a surface, which improves the sealing effect.
  • Clamp 30 and shoulder 28 pressurize gasket 30 thus creating the actual sealing effect between flange 24 and gasket 26 .
  • FIG. 3 shows the conically formed gasket 26 with five different configurations of clamp 30 .
  • the different configurations of FIG. 3 and the following figures can alternatively be selected as needed and serve to adapt the sealing effect of filtration means 10 to individual operating conditions.
  • Clamp 30 partly abuts housing 12 and partly gasket 26 and is secured to housing 12 in a manner not shown in more detail, for example screwed.
  • Gasket 26 in FIG. 3 (and in the following figures) in each case projects beyond flange 24 from the outside radially inwardly.
  • a frontal exterior surface of gasket 26 in this case has ring-like or bulging projections 34 concentric to the longitudinal axis of filtration means 10 with a semicircular cross-section.
  • housing 12 at its frontal outer surface has a groove 36 that is also concentric to the longitudinal axis of filtration means 10 .
  • said clamp has grooves 37 that are complementary to projections 34 and in which in the installation position projections 34 are received thereby fixing gasket 26 .
  • a corresponding projection of clamp 30 engages with groove 36 , which also serves a fixation or centering of clamp 30 .
  • said clamp has a circumferential groove 38 having an approximate semicircular cross-section at the same height of groove 36 of housing 12 , but bulged out oppositely to the latter. Said two grooves 36 , 38 thus form in the installation position a circumferential receiving space having an approximate circular cross-section into which an O-ring 40 is inserted. A flat surface 42 of clamp 30 abuts projections 34 .
  • flat surface 42 is axially offset outwardly in comparison with embodiment b).
  • flat surface 42 is axially offset inwardly (toward gasket 26 ) in comparison with embodiment b.
  • the use of an O-ring is not necessarily provided for, thus a corresponding circumferential groove is missing. Even in this embodiment it is possible to use an O-ring and to compress it simply between the flat surfaces of clamp and housing in a manner so that it exerts a sealing effect.
  • clamp 30 In a fifth embodiment e) of clamp 30 the entire surface of clamp 30 is not structured rather formed flat and thus represents the simplest form of clamp 30 .
  • FIGS. 4 and 5 show options for the configuration of the area of gasket 26 in the upper and in the lower end portion of filtration means 10 .
  • the filter assembly comprising filter elements 16 and flanges 26 is inserted in the lower end portion in one stage of housing 12 , gasket 26 rests axially on shoulder 28 of housing 12 with a bottom side formed with protrusions 34 .
  • the gasket has projections 34 axially outwardly or upwardly, which abut clamp 30 according embodiment d) of FIG. 3 .
  • a sealing ring 46 is inserted with its angularly formed lower side in a circumferential groove 36 having a rectangular cross-section and abuts the planarly formed portion 42 of clamp 30 with its circular-shaped upper side. Resiliently formed clamp 30 impinges projections 34 and sealing ring 46 with an axial compressive force.
  • the filter assembly comprising filter elements 16 and flanges 26 in the lower end portion is placed flat of a portion 48 of housing 12 at an edge; gasket 26 lies with an axial front side that is formed with projections 34 , on the flat portion 48 of housing 12 .
  • sealing ring 46 is inserted with its angularly formed lower side in groove 36 of housing 12 and abuts the planarly formed clamp 30 with its circular-shaped upper side. Resiliently formed clamp 30 impinges projections 34 and sealing ring 46 with an axial compressive force.
  • FIGS. 6 to 10 show further options for the configuration of gasket 26 with clamp 30 .
  • gasket 26 has bulging, circumferential projections 34 that are axial and concentric to the longitudinal axis of filtration means 10 at an axial exterior surface (facing clamp 30 ).
  • housing 12 comprises groove 36 with rectangular cross-section into which O-ring 40 is inserted with some clearance.
  • the planarly formed clamp 30 (according to embodiment e) of FIG. 3 ) abuts O-ring 40 and projections 34 .
  • Resiliently formed clamp 30 impinges projections 34 and O-ring 40 with an axial compressive force.
  • housing 12 comprises groove 36 having a semicircular cross-section and clamp 30 , and opposite groove 38 , into which O-ring 40 is inserted.
  • Clamp 30 according to embodiment c) of FIG. 3 abuts O-ring 40 and projections 34 .
  • Resiliently formed clamp 30 impinges projections 34 and O-ring 40 with an axial compressive force.
  • housing 12 comprises groove 36 having a rectangular cross-section into which sealing ring 46 is inserted with its angularly shaped lower side.
  • Clamp 30 according to embodiment c) of FIG. 3 abuts the circular upper portion of sealing ring 46 and projections 34 with the axially outwardly offset surface 42 .
  • Resiliently formed clamp 30 impinges projections 34 and sealing ring 46 with an axial compressive force.
  • housing 12 comprises groove 36 having a rectangular cross-section into which sealing ring 46 is inserted with its angularly shaped side.
  • Clamp 30 according to embodiment d) of FIG. 3 abuts the circular portion of sealing ring 46 and projections 34 with the inwardly offset surface 42 .
  • Resiliently formed clamp 30 impinges projections 34 and sealing ring 46 with an axial compressive force.
  • housing 12 comprises groove 36 having a rectangular cross-section into which sealing ring 46 is inserted with its angularly shaped lower side.
  • Planarly formed clamp 30 according to embodiment e) of FIG. 3 abuts the circular upper portion of sealing ring 46 and projections 34 .
  • Resiliently formed clamp 30 impinges projections 34 and sealing ring 46 with an axial compressive force.
  • Filtration means 10 can be produced inexpensively by a production process described in the first part of the document.
  • the assembly can be done also on location (on site).
  • the choice of the appropriate embodiment or configuration of the area of gasket 26 can be determined by current conditions on location.
US14/238,155 2011-08-10 2012-08-02 Filter device and a production method Active 2034-08-04 US9833745B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102011080763 2011-08-10
DE102011080763.2 2011-08-10
DE102011080763A DE102011080763A1 (de) 2011-08-10 2011-08-10 Filtereinrichtung und ein Verfahren zur Herstellung
PCT/EP2012/065138 WO2013020887A1 (de) 2011-08-10 2012-08-02 Filtereinrichtung und ein verfahren zur herstellung

Publications (2)

Publication Number Publication Date
US20140251893A1 US20140251893A1 (en) 2014-09-11
US9833745B2 true US9833745B2 (en) 2017-12-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
US14/238,155 Active 2034-08-04 US9833745B2 (en) 2011-08-10 2012-08-02 Filter device and a production method

Country Status (10)

Country Link
US (1) US9833745B2 (de)
EP (1) EP2741844A1 (de)
JP (1) JP6092866B2 (de)
KR (1) KR20140079371A (de)
CN (1) CN103747853A (de)
AU (1) AU2012292985B2 (de)
CA (1) CA2844526A1 (de)
DE (1) DE102011080763A1 (de)
SG (1) SG2014010342A (de)
WO (1) WO2013020887A1 (de)

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DE102016107534A1 (de) * 2016-04-22 2017-10-26 Nanostone Water Gmbh Keramikmembranmodule mit äusserer Rahmenanordnung und zugehörige Verfahren
DE202017004987U1 (de) 2017-09-26 2019-01-03 Volkmann Gmbh Modulverbindung, modularer Behälter und Dichtungselement dafür
AU2020225112A1 (en) * 2019-02-19 2021-08-26 Frieslandcampina Nederland B.V. A product dispensing system, holder and manufacturing method
EP3733262A1 (de) * 2019-04-30 2020-11-04 Bucher Unipektin AG Dichtelement

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CA2844526A1 (en) 2013-02-14
CN103747853A (zh) 2014-04-23
AU2012292985A1 (en) 2014-03-06
WO2013020887A1 (de) 2013-02-14
DE102011080763A1 (de) 2013-02-14
AU2012292985B2 (en) 2017-03-09
JP2014521507A (ja) 2014-08-28
JP6092866B2 (ja) 2017-03-08
US20140251893A1 (en) 2014-09-11
EP2741844A1 (de) 2014-06-18
KR20140079371A (ko) 2014-06-26

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